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Police Minister Stuart Nash unaware of "deeply disappointing" comments of Wally Haumaha before his promotion and gives Louise Nicholas a commitment that police will keep improving their culture.

Police Minister Stuart Nash was unaware of Wally Haumaha's "deeply disappointing" comments to an investigation into police sex allegations before appointing him as the new deputy commissioner last month.

A Herald investigation this morning revealed Haumaha questioned why Louise Nicholas publicly accused his friends in the police of raping her in the 1980s and continued to support them after the scandal broke, according to interviews with fellow officers.

One officer told the 2004 Operation Austin investigation into the police sex allegations that Haumaha described Nicholas' allegations as "a nonsense" and that "nothing really happened and we have to stick together".

Nicholas, who now works with the police advising new recruits and supporting victims of abuse, was so angry to hear of Haumaha's appointment that she demanded a meeting with him and Commissioner Mike Bush to voice her opposition.

But Police Minister Stuart Nash, who recommended that the Governor-General appoint Haumaha to the role, said he was unaware of his comments in Operation Austin.

"The comments are deeply disappointing and are unacceptable.

"DC Haumaha has learned from that and has gone on to do substantial and worthwhile work to improve the safety of women and youth."

Nash gave a commitment to Louise Nicholas that police will not "take the foot off the accelerator" in regards to ongoing efforts to improve their response to victims of offending.

"I encourage women and men to speak up if they witness or are subjected to unacceptable conduct.

"People learn and people change. Police organisational culture and practice is now more progressive and empathetic.

"The drive to increase diversity in new recruits and at senior ranks is one sign of this. Police have spent ten years working to change their organisational culture and that work remains ongoing."

Haumaha was close friends with Clint Rickards, Brad Shipton and Bob Schollum when they worked together at the Rotorua police station in the 1980s and 1990s.

He remained friends with them after they left the station and telephoned Rickards - who was by then the Assistant Commissioner in charge of Auckland - shortly after Nicholas publicly alleged in 2004 the trio raped her in group sex sessions.

Her allegations - including being violated with a police baton -triggered an exhaustive police investigation, Operation Austin, as well as a Commission of Inquiry into the culture of the police and how sexual assault cases were investigated.

Rickards, Shipton and Schollum claimed the group sex with Nicholas was consensual and were found not guilty at the 2006 trial.

The jury was unaware Shipton and Schollum were already in prison on other rape charges laid by Operation Austin.

"Your arrogance, in my view, knew no bounds," Justice Ronald Young told Shipton and Schollum in sending them to prison.

"You were confident you could commit a serious crime and get away with it because you were policemen - and you almost did.''

The investigation also led to a prison sentence for John Dewar, the former head of the Rotorua CIB who was convicted of four charges of attempting to pervert the course of justice.

He covered up the historic sex allegations against Rickards, Shipton and Schollum when Nicholas first came forward in 1993, as well as giving inadmissible evidence at two trials of another police officer Nicholas alleged raped her as a teenager.

Operation Austin and the Commission of Inquiry, led by Dame Margaret Bazley, exposed sleazy elements of police culture and led to widespread changes in the force.

Detectives interviewed colleagues of the trio shortly after an investigation by the Dominion Post and TVNZ published Nicholas' allegations in January 2004.

Haumaha was a senior sergeant in Rotorua when he was interviewed about the culture of the station in the 1980s.

"In a nutshell, the culture of the police in the mid 80s was work hard and play hard in terms of enjoying ourselves," he said to the Operation Austin investigation.

Haumaha told Detective Sergeant John Price, now the superintendent in charge of the Canterbury district, that he was aware Dewar investigated Nicholas' rape complaint in 1993, although he never heard any mention of a police baton.

He described Schollum as a good friend, a dynamic leader and a "legend in his own right"."It was no secret that Bob was attractive to a lot of women. The legend was that he was never short of a girlfriend or female company," Haumaha told Price.

He also offered the name and phone number of a woman from his marae, whose daughter babysat for Schollum, to vouch for him.

"My people who knew Bob were shocked by these allegations of rape, as this was not the Bob they knew."

Haumaha also spoke highly of Rickards and Shipton, who was an "awesome cop and good friend" whom other police officers were jealous of.

Shipton never mentioned anything about group sex, Nicholas or a baton, Haumaha told Price.

"I feel that people got the wrong impression of Brad. He was a big softie at heart."Haumaha volunteered to Price that he called Rickards as soon as the Nicholas allegations were published and his friend adamantly denied them.

"I expect him to play a key role to strengthen Māori leadership within Police and enhance the relationship between police and Māori communities, to reduce victimisation and offending."

Nicholas acknowledged what Haumaha has achieved but pointed to his statement to Operation Austin - and other remarks attributed to him by Dean - as evidence of a poor attitude towards women.

"I had seen Wally around in Rotorua. Clearly he ran with this crowd," said Nicholas, referring Haumaha's statement about his friendship with the men she accused of rape.

"I'm not saying he did anything wrong, I don't know. But I've never been comfortable standing in the same room with Wally because he was mates with these guys."

At a chance meeting at a Police College event in the past year or so, Nicholas said she declined an offer from Haumaha to have a "cup of coffee and put water under the bridge".

But when he was appointed to the deputy role, Nicholas said she "hit the roof" and asked for a meeting with Bush and Haumaha.

She also insisted Deputy Commissioner Mike Clement, who was a senior member of the Operation Austin team, be present.

"I didn't hold back. I said 'I've read your statement Wally and I know what you said. You put it out there about how wonderful these men were'," said Nicholas.

She was reluctant about speaking publicly for fear of being branded racist; an attack leveled at her by supporters of Clint Rickards at the time of her original allegations.

"I'm not doing this to be a vindictive bitch. The police have worked hard to change their culture over the last 10 years or so," said Nicholas.

"But without the right leadership, without the right attitude towards women, they can tumble backwards.

"Will Wally uphold what the police have fought hard for? Or will he take the foot off the accelerator?"

The Herald left a message on Haumaha's phone yesterday, which was responded to by a senior police media advisor.

Later, in a written statement, Bush confirmed Haumaha met Nicholas to "assure her he remains committed to continuing the work the organisation has done as a result of the Commmision of Inquiry to improve our culture and our service to victims of sexual assault".

"He highly values the relationship that NZ Police has with Louise Nicholas.

"He emphasises our values of empathy, diversity at every opportunity both with staff and the public. He has been recognised several times for this work including a QSM and ONZM."